mmc: queue: Do not attempt request merging

According to Admin Magazine, request merging is mostly for rotation
disks in order to reduce seek times by grouping together requests. This
reduces the frequency of disk spin-ups. However, flash storage does not
suffer from long disk seeks. Disable request merging in order to reduce
overhead and improve throughput.

Signed-off-by: Tyler Nijmeh <tylernij@gmail.com>
Signed-off-by: Oktapra Amtono <oktapra.amtono@gmail.com>

Author: tytydraco

drivers/mmc/card/queue.c

@@ -397,6 +397,7 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
 
 	blk_queue_prep_rq(mq->queue, mmc_prep_request);
 	queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mq->queue);
+	queue_flag_set_unlocked(QUEUE_FLAG_NOXMERGES, mq->queue);
 	queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, mq->queue);
 	if (mmc_can_erase(card))
 		mmc_queue_setup_discard(mq->queue, card);